WO1998022705A1

WO1998022705A1 - Intake device of internal combustion engine

Info

Publication number: WO1998022705A1
Application number: PCT/JP1997/004222
Authority: WO
Inventors: Akihide Yamaguchi; Yurio Nomura; Syuya Mikami; Yasutoshi Kameda; Toshiaki Nakayama; Takao Yamamoto
Original assignee: Denso Corporation
Priority date: 1996-11-22
Filing date: 1997-11-19
Publication date: 1998-05-28
Also published as: US6024188A; EP0892169B1; DE59707508D1; EP0892169A1; EP0892169A4

Abstract

An intake device includes an air filter (21) for filtrating suction air sucked into an internal combustion engine (10), an intake manifold (100) made of resin, for introducing the suction air filtrated by the air filter (21) into an intake port (10a) of the engine, and a case main body (12) made of resin and a cap portion (13) made of resin. The air filter (21), the intake manifold (100), a fuel injection valve (40), and so forth, are accommodated in the case main body (12) and the cap portion (13), and the case main body (12) and the cap portion (13) have a resin double-wall structure having inside walls (14 and 15) and outside walls (16) and (17). Air layers (18 and 19) for interrupting sound and heat are formed between the inside walls (14 and 15) and the outside walls (16 and 17).

Description

Intake device for internal combustion engine

Technical field

The present invention relates to an intake device for an internal combustion engine, and more particularly to an improved structure for reducing noise radiated from the intake device to the outside and reducing a rise in intake air temperature.

Light

The present invention also relates to an intake device for an intake device of an internal combustion engine, which can improve the degree of freedom in setting the shape of an air filter case. ) Is suitable for use in an integrated air intake system.

Background art

2. Description of the Related Art Conventionally, European Patent No. 0523028 B1 and Japanese Patent Application Laid-Open No. 7-22 9454 disclose an intake device in which a plurality of intake system components are integrally integrated. In each of these air intake devices, an air filter for cleaning the air intake is arranged in the air filter case, and the sealing surface of the air filter is set between the air filter case and the inner wall of the air filter case to support the air filter. Fixed. Japanese Patent Application Laid-Open No. 7-148864 discloses that an internal molded body having a predetermined shape of a hollow portion of an intake manifold is molded by blow molding, and a plurality of divided molded parts are formed on the outer periphery of the internal molded body. An arrangement and joining of outer moldings is disclosed.

However, in the former European Patent No. 0523028 B1 and Japanese Patent Application Laid-Open No. 7-229544, the air filter is supported and fixed on the inner wall of the air filter case. The shape of the case must necessarily be designed to meet the purpose of supporting and fixing the air filter. The degree of freedom in setting the shape of the tool is low. For this reason, when installing various devices in a very limited narrow space, such as in the engine room of a vehicle, it is necessary to install the air intake device in the engine room due to the shape of the air filter. Difficult cases may occur.

In particular, in the case of an intake device in which a plurality of intake system components are integrally integrated, the above-mentioned drawbacks appear remarkably because the entire intake device has a large size and is a single unit.

Further, in the above-described structure, since the passage wall of the intake device is formed of a simple single wall, there is a problem that the intake sound (pulsation sound) of the internal combustion engine is more easily transmitted than the passage wall. In addition, the temperature of the intake manifold rises due to radiant heat from the surroundings of the internal combustion engine, and as a result, the intake air temperature of the internal combustion engine also rises, leading to a decrease in engine performance.

In the latter Japanese Patent Application Laid-Open No. 7-1488864, since the outer wall of the inner molded body is joined to the outer molded body, the inner wall has a double wall, so that the sound insulation and the heat insulating effect are improved as compared with the former. However, since the outer molded body is simply stuck to the outer periphery of the inner molded body, the sound insulation and heat insulation effects are insufficient. Disclosure of the invention

The present invention has been made in view of the above, and an object of the present invention is to provide an intake device for an internal combustion engine having excellent mountability.

An object of the present invention is to improve the sound insulation and heat insulation effects in an intake device for an internal combustion engine.

Another object of the present invention is to provide an intake device for an internal combustion engine in which intake system components are compactly integrated.

Another object of the present invention is to increase the degree of freedom of the shape of the air filter case.

The present invention employs the following technical means to achieve the above object. According to the first aspect of the present invention, the air filter (2 1) for filtering intake air to the internal combustion engine (10) and the intake air filtered by the air filter (2 1) are supplied to the intake air of the internal combustion engine (10). An intake manifold (100) leading to the port (10a) is provided, and the intake manifold (100) is formed of a resin double wall having an inner wall (14) and an outer wall (16). The structure is characterized by forming a sound insulation layer (18) between the inner wall (14) and the outer wall (16).

As a result, the sound insulation layer (18) between the inner wall (14) and the outer wall (16) prevents the pulsating sound of intake air passing through the intake manifold (100) from being radiated to the outside. At the same time, the temperature rise of the intake air in the intake manifold (100) due to the radiant heat from the internal combustion engine (10) can be suppressed.

Therefore, the internal combustion engine (100) can exhibit both the effects of reducing noise and improving the performance, and the intake manifold (100) exhibiting such effects can be relatively easily formed by the double wall structure made of resin. Can be manufactured at low cost.

In the invention according to claim 2, an air filter (21) for filtering intake air to the internal combustion engine (10) and a resin filter case (12, 1) for accommodating the air filter (21) are provided. 3) and a resin intake manifold (100) for guiding the intake air filtered by the air filter (21) to an intake port (10a) of the internal combustion engine (10).

By storing the intake manifold (100) in the filter case (12, 13), the passage wall surface of the intake manifold (100) is defined as an inner wall (14). The filter case (12, 13) has a double wall structure in which the wall surface is an outer wall (16).

A sound insulation layer (18) is formed between the inner wall (14) and the outer wall (16).

As a result, the double-walled structure of the filter case (12, 13) and the sound insulation layer (18) are formed to improve the effects of reducing the noise and improving the performance of the internal combustion engine (10). Can demonstrate. Moreover, in addition to this, the intake manifold (100) is accommodated in the filter case (12, 13), so that the wall surface of the intake manifold (100) itself is used to form a double wall structure. As a result, the air filter (2 1) and the intake manifold (100) are housed in the same case as a single unit. The integration of the device facilitates mounting work on the internal combustion engine (10).

In the invention according to claim 3, the air filter (2 1) for filtering intake air to the internal combustion engine (10) and the filter case (12, 13) accommodating the air filter (2 1) are provided. Prepared,

The filter case (12, 13) is provided with a sound insulation layer (18, 19).

As a result, the air filter (21) exhibits a sound insulation and heat insulating effect with respect to the intake air that is filtered by the air filter (21), and is effective in both reducing noise and improving performance of the internal combustion engine (10).

In the invention according to claim 4, the intake air filtered by the air filter (21) is guided to the intake port (10a) of the internal combustion engine (10) in the filter case (12, 13). It is characterized by containing a resin intake manifold (100). Thereby, in addition to the effect of the third aspect, mounting can be facilitated by integrally housing the air filter (21) portion and the intake manifold (100). The invention according to claim 5 is characterized in that the filter case (12, 13) accommodates a fuel system component (40, 41) for supplying fuel to the internal combustion engine (10). . As a result, the fuel system components (40, 41) can be integrated.

The invention according to claim 6 is characterized in that the fuel system component is a fuel injection valve (40) for injecting fuel into the internal combustion engine (10). As a result, the radiation of the opening and closing operation noise of the fuel injection valve (40) is also reduced by the filter case (12, 13). It can be suppressed by the sound insulation layer (18, 19).

The filter case (12, 13) has a double wall structure made of resin having an inner side wall (14, 15) and an outer side wall (16, 17). The sound insulation layer (18, 19) can be formed between the inner wall (14, 15) and the outer wall (16, 17).

Further, in the invention according to claim 8, the intake system component (21, 25, 100) for passing intake air to the internal combustion engine (10) is provided with a sound insulation layer (18, 19). (12, 13).

Here, the intake system components include an air filter (21) for purifying the intake air, a throttle valve (25) for adjusting the intake flow rate, and the intake air from the throttle valve (25) being used for the internal combustion engine (10). It includes all the components that allow the intake air to pass through, such as the intake manifold (100) that allows the intake air to pass through.

According to claim 8, the sound-insulating effect on the intake air passing through the intake system components (21, 25, 100) is exhibited, which is effective in both reducing noise and improving performance of the internal combustion engine (10). Can be played.

The invention according to claim 9 is characterized in that, in the case (12, 13), a fuel system component (40, 41) for supplying fuel to the internal combustion engine (10) is housed. .

Thereby, in addition to the effect of claim 8, it is possible to facilitate the mounting by integrating the intake system components (21, 25, 100) and the fuel system components (40, 41).

The case (12, 13) has a double-wall structure made of resin having an inner wall (14, 15) and an outer wall (16, 17), as claimed in claim 10, A sound insulation layer (18, 19) can be formed between (14, 15) and the outer wall (16, 17).

The sound insulation layer is configured as an air layer (18, 19) as claimed in claim 11 it can. Further, the sound insulation layer can be made of a sound insulation material filled between the inner wall (14, 15) and the outer wall (16, 17). . —Furthermore, the sound insulation layer can be made of a foamable material (54). Further, as in claim 14, the sound insulating layer may be formed by adhering the foamable material (54) to the wall surfaces of the cases (12, 13). Alternatively, the foam (54) can be formed by secondary molding at the time of molding the case (12, 13).

According to the invention described in claims 16 to 20, in the filter case (12, 13), an air filter (21) and an outlet duct (17) through which the intake air filtered by the air filter (21) flows. 24), and a filter support (22) formed in a shape corresponding to the air filter (21) at the inlet of the outlet duct (24). 2 1) is detachably supported independently of the Phil's case (1 2 and 1 3).

Since the air filter (21) is supported independently from the filter case (12, 13), the filter case (12, 13) is supported and fixed by the air filter (21). Can be designed independent of surface. As a result, the degree of freedom in designing the shape of the filter case (12, 13) is increased, and the filter case (12, 13) can be set to a shape that can be easily mounted around the internal combustion engine (10). . Therefore, it is easy to mount the intake device even in a narrow space with a large constraint. Furthermore, since the air filter (2 1) can be supported in a state where it is separated from the filter case (12, 13), the cross-sectional area of the intake inflow passage to the air filter (2 1) can be increased, and The effect that pressure loss can be reduced is also obtained.

In the invention according to claim 17, the throttle valve (25) connected to the outlet of the outlet duct (24) and the throttle valve (25) are provided in the filter case (12, 13). The intake air that has passed through the cylinder is drawn into the cylinders of the internal combustion engine (10). It is characterized by containing an intake manifold (100) leading to the air port (10a).

According to the invention of claim 17, in the case where the filter case, the throttle valve and the intake manifold are integrally integrated, the mountability of the intake device can be improved.

In addition, the integration of the intake system components is performed, as in the invention of claim 18, by providing an air filter (21) and an air filter (21) in the upper part of the filter And the filter support (22), and the outlet duct (24), the throttle valve (25), and the intake manifold are located below the air filter (21) and the filter support (22). (100) can be arranged.

Then, as in the invention according to claim 19, the air filter (21) has a filtering portion (21a) for filtering intake air, and protrudes outward from an outer peripheral portion of the filtering portion (21a). And a flange portion (24a) is formed on the outer periphery of the filter support (22), and the flange portion (24a) is formed with the flange portion (24a). 2 1 b) can be detachably supported by the clamp (23).

In particular, in the invention according to claim 20, the air filter (21) has a filtering portion (21a) for filtering intake air, and a flange protruding outward from an outer peripheral portion of the filtering portion (21a). And a fitting groove (24b) formed on the outer periphery of the filter support (22), and the flange (21b) is fitted to the fitting groove (24b). It is characterized by being elastically detachably fitted to and supported by.

According to such a filter support structure, the flange (21b) of the air filter (21) can be elastically directly supported directly on the fitting groove (24b) of the filter support (22). The cost can be reduced by simplifying the structure.

The reference numerals in parentheses of the above means indicate the correspondence with specific means described in the embodiment described later. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a longitudinal sectional view of an intake device for an internal combustion engine showing one embodiment of the present invention, and shows a B-; a section of FIG. FIG. 2 is a longitudinal sectional view of the intake device of FIG. FIG. 3 is a sectional view taken along line AA of FIG. FIG. 4 is a perspective view of the air filter shown in FIGS. FIG. 5 is a partially enlarged sectional view of a support portion of the outlet duct shown in FIG. FIG. 6 is a partial cross-sectional view showing an example of the air filter support structure, and FIG. 7 is a partial cross-sectional view showing another example of the air filter support structure. 8 and 9 are partial cross-sectional views showing a method of molding foam resin on the outer wall of the surge tank, and FIGS. 10 and 11 are partial cross-sectional views showing a method of molding foam resin on the outer wall of the intake manifold pipe. It is. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 to 6 show an embodiment in which the present invention is applied to an intake device of an internal combustion engine for running a vehicle. The internal combustion engine 10 is a four-cylinder type in this example, and is located immediately next to the internal combustion engine 10. An intake device 11 according to the present invention is disposed adjacent to the side. The intake device 11 is a compact integration of various intake system components described below, and the case (air filter case) of the intake device 11 is directed upward from below in the vehicle vertical direction. And a box-shaped cap body 13 that closes the upper end opening 12 a of the case body 12.

The cap portion 13 can be opened and closed by a plurality of hinges (not shown) with respect to the upper end portion 12a of the case body 12 and can be detachably fastened by fastening means such as appropriate clamps. is there.

Each of the case body 12 and the cap portion 13 has a certain degree of elasticity, such as nylon, and is made of a molded article of a resin material having excellent strength. In addition, during this resin molding, both the case body 12 and the cap 13 are formed on the inner wall. It has a double wall structure consisting of 14 and 15 and outer walls 16 and 17 and has a predetermined amount (for example, 2 to 3) of the inner walls 14 and 15 and the outer walls 16 and 17. The air layers 18 and 19 are formed between these walls.

The intermediate air layers 18 and 19 are set to obtain sound insulation and heat insulation. In FIGS. 1 and 2, the distance D 1 between the narrow portions of the air layers 18 and 19 is shown in FIGS. Is, for example, about 2 to 3 mm, the distance D2 between the intermediate width portions is about 5 to 8 mm, and the distance D3 between the wide portions of the cap portion 13 is about 12 to 18 mm.

The reason for setting the distances D1 to D3 having different widths in the air layers 18 and 19 in this manner is mainly based on the reason for resin molding. Of the 19, a part where the wide space D3 is formed is a contact portion 19a for directly contacting the inner wall 15 and the outer wall 17 in order to increase rigidity and suppress vibration. Are formed at multiple locations. The distance between the air layers 18 and 19 is preferably set to at least about 2 mm or more in order to obtain sound insulation and heat insulation.

On one side surface of the cap portion 13, an air inlet 20 projecting in the horizontal direction is provided in the body. The air inlet 20 has a substantially elliptical cross section (see FIG. 1). It is for introducing the inside air (outside air). An air filter 21 for purifying the air introduced from the air inlet 20 is disposed at a position below the ceiling surface of the inner wall 15 of the cap portion 13 by a predetermined distance. The air filter 21 has, for example, a configuration as shown in FIG. 4 and has a corrugated filter portion 21a. The overall planar shape of the filter portion 21a is rectangular. protrudes into the flanged portion 2 1 13 ^month? outward periphery four sides. The filter portion 21a and the flange portion 21b are integrally formed from the same filter material (for example, a nonwoven fabric of synthetic fiber, filter paper, or the like). In addition, each corrugated plate part of the filtration part 21a is in the shape of a bag in which the side ends 21c and 21d are closed. Then, as the air passes through the filtering section 21a as shown by arrows a in FIGS. 4 and 2, dust and the like in the air are removed by the filtering section 21a. The air is cleaned.

Below the air filter 21, there is disposed a resin filter support 22 formed in a rectangular dish shape corresponding to the air filter 21, and an outer periphery of the filter support 22. The flange portion 2 1b of the air filter 21 is placed on the side flange portion 2 2a, and the flange portion 2 2a and the flange portion 2 1b can be detachably fastened by an appropriate clamp 23. It is like that. Accordingly, the air filter 21 is supported and fixed to the filter support 22 independently of the case main body 12 and the cap portion 13 in a state of being separated from the case main body 12 and the cap portion 13.

The filter support 22 has a tubular portion 22b for clean air outflow at the center thereof, and the tubular portion 22b is connected to the upper end of the outlet duct 24 by joining means such as vibration welding. Are joined. The outlet duct 24 has a substantially cylindrical shape, and is arranged at a substantially central portion of a space inside the case including the case body 12 and the cap portion 13. The outlet duct 24 extends vertically as shown in FIG. 1, and its lower end is arranged to bend leftward in FIG.

The lower end of the outlet duct 24 is fitted and joined to the upper end (upstream end) of the resin body 25a of the throttle valve 25. As is well known, the throttle valve 25 is operated by an accelerator mechanism of the vehicle to adjust the amount of intake air taken into the internal combustion engine 10, and has a lower end (downstream side) for reducing intake pulsation. in so that the surge evening tank 2 6 forces to expand the volume of the downstream space of the slot Torubarubu 2 ^5? it is formed.

The surge tank 26 is located at the lowermost part in the case main body 12, and is substantially rectangular as shown by a broken line in FIG. The inlets of the intake manifold pipes 27 a to 27 d are open to the space inside the surge tank 26. Here, since the internal combustion engine 10 of the present example is of a four-cylinder type, there are four intake manifold pipes 27a to 27d.

Incidentally, in FIG. 1 illustrates only the intake manifold pipe 2 7 b ^power?, The other intake The manifold pipes 27a, 27c, and 27d all have the same shape, and the space inside the case body 12 is smoothly semicircularly formed from below to above over an angle range of approximately 180 °. After that, the shape is further extended linearly toward the intake port 10. A of each cylinder of the internal combustion engine 10.

The case body 12 is detachably fastened and fixed to the internal combustion engine 10 by fastening means such as bolts 45 (see FIG. 1). By fixing the case body 12, each intake manifold pipe 2 is fixed. 7a to 27d are connected to the intake ports 10a of the cylinders of the internal combustion engine 10, respectively.

The space communicating with the air inlet 20 in the cap 13 is a dust side space 28, and the space inside the surge tank 26 in the case main body 12. The space communicating with the hole 26a (see Fig. 2) is the space 29 of the clean side. The space 28 of the dust side in the cap 13 and the space 29 of the clean side in the case body 12 are integrated with each intake manifold pipe 27 a to 27 d and between these pipes. It is partitioned by a molded resin partition wall 30 (see FIG. 2).

An outlet duct 24 passes through the center of the partition wall 30. FIG. 5 is an enlarged view of the through portion of the outlet duct 24. A through hole 30a through which the outlet duct 24 passes is provided at the center of the partition wall 30. A rubber sealing gasket 31 is arranged in a ring shape on the outer peripheral side of 0a. On the other hand, the outlet duct 24 is formed with an annularly projecting flange portion 24a so that the sealing gasket 31 can be elastically compressed and deformed by the flange portion 24a. O

Nuts 32 are integrally insert-molded at a plurality of locations on the outer peripheral side of sealing gasket 31 in partition wall 30, and bolts 33 are fastened to nuts 32. The outlet duct 24 is fixed to the partition wall 30 airtightly and detachably. As shown in FIGS. 1 and 2, a resin partition wall 34 is formed around the resin body 25a of the throttle valve 25 so as to extend integrally from the upper wall surface of the surge tank 26 ^. Have been. The partition wall 34 separates the space 35 around the throttle valve 25 from the clean side space 29 in the case body 12. Since this space 35 is opened to the outside air space in the engine room by the window 36 (see FIG. 1) provided in the case body 12, this space 35 is a space on the dust side. The window portion 36 is a window portion for inserting the throttle valve 25 into the case body 12 when the throttle valve 25 is assembled.

In the center of the upper wall surface 34a of the partition wall 34, there is provided a through hole 34b through which the lower end portion of the outlet duct 24 penetrates, and this through hole 34b has a ring shape. A molded rubber gasket 34c for the seal is fitted, and the gasket 34c seals the space 35 between the dust side and the space 29 on the clean side.

The term "intake manifold 100" as used in the present invention is a general term for a portion composed of the surge tank 26, the intake manifold pipes 27a to 27d, the partition walls 30, 34, and the like. Each part of the intake manifold 100 is made of resin. The resin intake manifold 100 is accommodated in the case body 12 to form a double wall structure of the case body 12. That is, of the intake manifold 100, the passage wall itself facing the inside of the outside wall 16 of the case body 12 constitutes the inside wall 14.

In the middle of each intake manifold pipe 27a to 27d, there is provided a communication passage 37 communicating with a clean side space 29 in the case body 12, respectively. A variable intake valve 38 is provided in the passage 37, and the variable intake valve 38 is driven by an actuator 39 such as a negative pressure motor to adjust the opening of the communication passage 37.

The outlet side of each intake manifold pipe 27 a to 27 d (in other words, A fuel injection valve 40 for injecting fuel (gasoline) is disposed at a position (upstream of the intake port 10a) of the engine 10). As shown in FIG. 1, the fuel injection valve 40 is disposed in the cap portion 13 and the dust side space 28 of the case body 12, while the four fuel injection valves 40 are The fuel supply pipe (distribution pipe) 41 for supplying the fuel has a branch pipe section 41a (see FIG. 3) corresponding to each fuel injection valve 40, and a small-diameter portion at the tip of the branch pipe section 41a. Each of the fuel injection valves 40 is adapted to be seal-fitted into an opening opening at the fuel inlet side end (upper end).

Mounting flanges 4 1 b are provided at two places in the middle of the fuel supply pipe 4 1, and these mounting flanges 4 1 b are tightened to the mounting base 43 integrally formed on the case body 12 with bolts 42. It is fixed. Thereby, the fuel injection valve 40 and the fuel supply pipe 41 can be simultaneously detachably fixed to the mounting base 43. Further, the fuel injection valve 40 is airtightly fixed with a rubber sealing gasket 44 interposed between the fuel injection valve 40 and the mounting base 43, whereby the outside air in the dust-side space 28 is opened. From entering directly into each intake manifold pipe 27a-27d.

As is well known, the fuel injection valve 40 has an electromagnetic structure in which the valve opening time is automatically controlled by a fuel injection control device. One end (the right end in FIG. 3) of the fuel supply pipe 41 protrudes out of the case body 12, and a fuel supply pump is connected to the protruding end through a fuel pipe (not shown). The fuel power pumped from the pump is introduced into the fuel supply pipe 41.

Next, the operation of the above configuration will be described. When the internal combustion engine is operated, outside air is sucked in from the air inlet 20 of the cap 13, and this air flows into the dust-side space 28 in the cap 13, and then flows into the air filter 21. The intake air passes through the filtration part 21a as shown by the arrow a in FIG. 4 and FIG. As a result, dust and the like in the air are removed by the filtering section 21a, and the intake air is cleaned.

Next, the cleaned intake air passes through a dish-shaped filter support 22 and an outlet duct 24 and reaches a throttle valve 25, where the suction air is supplied. The flow rate is adjusted. Then, the intake air passes through the surge tank 26 to absorb the pulsation, and thereafter, the intake air is distributed to the respective intake manifold pipes 27 a to 27 d, and passes through the respective pipes 27 a to 27 d. It is sucked into each cylinder of the internal combustion engine 1Q.

On the other hand, the fuel is pressure-fed by a fuel supply pump (not shown), introduced into the fuel supply pipe 41, and then distributed to each fuel injection valve 40 via each branch pipe section 41a. The fuel is injected into the outlet side of each of the intake manifold pipes 27a to 27d by opening each fuel injection valve 40 as appropriate by electronic control. Therefore, the fuel and air become a mixture, and are sucked into each cylinder from the intake port 10a of the internal combustion engine 10.

By the way, in the intake device 11 arranged adjacent to the side of the internal combustion engine 10, the case main body 12 for accommodating the components thereof, the cap portion 13, the inner side walls 14, 15 and the outer side Since it has a double wall structure having walls 16 and 17 and air layers 18 and 19 are formed between the inner walls 14 and 15 and the outer walls 16 and 17, the intermediate air layer 1 8, 1 9 ^forces? sound insulation, perform an action as a heat insulating layer.

Therefore, the pulsating sound of the intake air sucked into each cylinder of the internal combustion engine 10 is transmitted through the case body 12 and the cap portion 13 and released to the outside. Can be effectively reduced.

At the same time, the heat insulation of the air layers 18 and 19 can prevent the space temperature in the case body 12 and the cap portion 13 from rising due to radiant heat from the internal combustion engine 10, so that the intake manifold 1 The temperature of the part 100, and thus the temperature of the intake air passing through the intake manifold 100, can be maintained at a relatively low temperature, and the engine performance can be improved.

Further, as shown in FIG. 1, the fuel injection valve 40 is disposed in the cap portion 13 and the dust-side space 28 of the case body 12, so that the opening and closing operation sound of the fuel injection valve 40 is reduced ^. Radiation to the outside can also be effectively reduced by the sound insulation effect of the air layers 18 and 19 described above. Further, according to the present embodiment, by forming the air layers 18 and 19 in the middle layer of the double wall structure of the inner walls 14 and 15 and the outer walls 16 and 17, sound insulation, Because of the heat insulation effect, the weight increase of the filter case can be minimized. Next, a description will be given of a method of forming the case main body 12, the cap portion 13, and the intake manifold 100, which are formed of a molded article of a resin material. First, the case main body 12 and the intake manifold 100 are described. The hollow portion including the air layer 18 can be integrally formed by a so-called lost-pack molding method in which the resin material is also formed of a low melting point material having a low melting point.

Further, after the case body 12 and the intake manifold 100 are divided into a plurality of separate members and subjected to injection molding, the plurality of members may be integrally joined by a joining method such as vibration welding.

The hollow portion including the air layer 18 can be formed by a method such as a gas air injection molding method, a professional molding method, or a multi-piece molding method.

On the other hand, the cap portion 13 can be integrally formed by a blow molding method into a double wall structure having an air space 19, but after dividing into a plurality of separate members and performing injection molding, the plurality of members are vibrated. They may be integrally joined by a joining method such as welding. FIG. 6 shows an example of a specific support structure for the air filter 21 and the filter support 22. FIG. 6 shows a protruding portion 21 on the upper surface of the flange portion 21b of the air filter 21. c, and the flange 21 b is placed on the upper surface of the flange 22 on the outer periphery of the filter support 22, and then a resin or metal clamp 23 is attached to the protrusion 21. The air filter 21 is supported and fixed to the filter support 22 by clamping the flange 21 2 and the flange 22 with the clamp 23 while holding the air filter 21 at c.

The clamp 23 of the present embodiment includes a support shaft 23a and two locking pieces 23b and 23c rotatably connected to the support shaft 23a.

In FIG. 7, a support wall 22 c is formed at an end of the filter support 22. This branch The retaining wall 22 c has a shape corresponding to the outer peripheral shape of the flange portion 21 b of the air filter 21, and extends in the thickness direction of the filtering portion 21 a of the air filter 21. A fitting groove 22 d having a width that allows the flange 21 b to be inserted is formed over the entire inner peripheral surface of the support wall 22 c.

Here, the flange-shaped portion 21b is elastically deformed outwardly (in the direction of the arrow b in Fig. 7) by a small amount when the support wall 22c is inserted into the fitting groove 22d. Over the convex part 22 e and into the fitting groove part 22 d. Therefore, after the insertion of the flange portion 2 1 b into the fitting groove portion 2 2 d is completed, the support wall 22 c elastically returns to the inward side (the direction opposite to the arrow b direction). The flange 21b can be securely held by the fitting groove 2d.

In the above-described embodiment, the case is described in which the outlet duct 24 and the filter support body 22 are separately molded and then joined together, but the examples of FIGS. 6 (a) and 6 (b) are used. Shows a case in which the filter support 22 is resin-molded integrally with the outlet duct 24.

(Other embodiments)

In the embodiment described above, the air layers 18 and 19 are formed between the inner walls 14 and 15 and the outer walls 16 and 17 of the case body 12 and the cap portion 13. Force \ In between the inner walls 14 and 15 and the outer walls 16 and 17, instead of the air layers 18 and 19, a sound insulation material made of porous foam such as urethane foam You can fill it. In this case, a sound insulating material may be formed between the inner walls 14 and 15 and the outer walls 16 and 17 by foaming the same material as the inner and outer walls with a foaming agent. .

Also, the force described in the case where the intake manifold 100 is housed in the air filter case composed of the case body 12 and the cap portion 13, and the intake manifold 100 is arranged outside the air filter case. In this case, the present invention can be applied. In this case, the intake manifold 100 is independent of the air filter case, What is necessary is just to form a double wall structure, and to form a sound insulation layer between the inner wall and the outer wall. In addition, the case body 12, cap part 13 and intake manifold 100 are not made into a double-wall structure, but are made into a single-wall structure.- Sound insulation materials are provided on one or both of the inner and outer surfaces of this single-wall structure It is good also as a structure to stick. Alternatively, at the time of molding the case body 12, the cap portion 13, or the intake manifold 100, a foaming resin as a partially foamable material may be secondarily molded.

FIGS. 8 and 9 show an example of a method in which the case main body 12 has a single-wall structure, and the foaming resin 54 is secondarily molded outside the wall 50. Fig. 8 shows a state in which the intake manifold 100 composed of the surge tank 26, the intake manifold pipes 27a to 27d, etc. is primarily molded using the molds 51 and 52. I have. The mold 51 has a structure that can be slid downward in FIG. 9, and the mold 52 can be slid to the right in FIG. Then, foaming resin 54 is injected into a gap formed by sliding the molds 51 and 52 to form a sound insulation layer.

Figs. 10 and 11 show the intake manifold pipes 27a to 27d, which are components of the intake manifold 100, as a single-wall structure, and a secondary resin foam resin 54 on the outer wall. It is an example of a shaping method. Fig. 10 shows a state in which the intake manifold 100 composed of the surge tank 26, the intake manifold pipes 27a to 27d, etc. is primarily molded using the mold 53. . The mold 53 has a structure that can be slid to the lower right of FIG. Then, foaming resin 54 is injected into a gap generated by sliding the mold 53 to form a sound insulation layer. '

According to the above-described embodiment, the air filter 21 can be supported irrespective of the mating surface of the case main body 12 and the cap portion 13, so that the integrated assembly extending over almost the same length as the cylinder row of the internal combustion engine 10. The degree of freedom in designing the three-dimensional filter cases 12 and 13 can be increased. Similarly, the air filter 21 does not need to be dimensioned exclusively for the integrated assembly.

In particular, the fuel supply device including the fuel injection valve 40 and the fuel supply pipe 41 is provided with a filter When the fuel supply device is housed in the case 12 and 13, the maintenance and inspection of the fuel supply device can be performed without removing the air filter 21, so the maintenance and inspection should be performed on the clean side downstream of the air filter 21. sometimes ^Dasutoka? can be prevented from entering.

It should be noted that, in order to improve maintenance and inspection, the distance between the filter support 22 and the fuel supply device in the configuration of FIG. 1 may be increased.

In addition, since the filter support 22 has a shape in which a tube is raised in a mushroom shape independently of the wall surfaces of the filter cases 12 and 13, dust that has entered the filter cases 12 and 13 can be prevented. When the air filter 21 is replaced, the air filter 21 is prevented from entering the inside of the filter support 22.

As described above, the filter support 22 can support the air filter 21 independently of the filter cases 12 and 13, and the filter support 22 itself is independent of the wall surfaces inside the filter cases 12 and 13. It is important that the tube be set up in the first place. Industrial applicability

As described above, according to the present invention, the sound insulation and heat insulation effect can be improved by providing the sound insulation layer on the wall surface of the case (12, 13). Further, according to the present invention, the intake system components can be compactly integrated by housing the intake manifold (100) in the cases (12, 13). Further, according to the present invention, since the air filter (21) is supported independently of the filter case (12, 13), the degree of freedom of the shape of the filter case (12, 13) can be increased. Can be As described above, the present invention can be used for an intake device of an internal combustion engine and contribute to improvement of its mountability.

Claims

The scope of the claims

1. An air filter (2 1) that filters the intake air to the internal combustion engine (10), and the intake air filtered by the air filter (2 1) is supplied to the intake port (10) of the internal combustion engine (10). a) with an intake manifold (100) leading to

The intake manifold (100) has a double wall structure made of resin having an inner wall (14) and an outer wall (16). An intake device for an internal combustion engine, comprising a sound insulation layer (18) formed therebetween.

2. An air filter (2 1) for filtering the intake air to the internal combustion engine (10), a resin filter case (12, 13) accommodating the air filter (2 1), and the air filter (2 A resin intake manifold (100) for guiding the intake air filtered in 1) to an intake port (10a) of the internal combustion engine (10).

By storing the intake manifold (100) in the filter case (12, 13), the passage wall surface of the intake manifold (100) is defined as an inner wall (14), and the filter case (12, 13) is formed. A double wall structure with the outside wall (16) as the outer wall,

An intake device for an internal combustion engine, wherein a sound insulation layer (18) is formed between the inner wall (14) and the outer wall (16).

3. It has an air filter (2 1) for filtering intake air to the internal combustion engine (10), and a filter case (12, 13) for accommodating the air filter (2 1).

An intake device for an internal combustion engine, wherein the filter case (12, 13) is provided with a sound insulation layer (18, 19).

4. In the filter case (12, 13), a resin intake manifold (10) that guides the intake air filtered by the air filter (21) to the intake port (10a) of the internal combustion engine (10). 4. The air intake device for an internal combustion engine according to claim 3, wherein the air intake device accommodates (100).

5. Supply fuel to the internal combustion engine (10) in the filter case (12, 13) The intake device for an internal combustion engine according to claim 3 or 4, wherein a component (40, 41) of a fuel system to be accommodated is accommodated.

6. The intake device for an internal combustion engine according to claim 5, wherein the component of the fuel hand is a fuel injection valve (40) for injecting fuel into the internal combustion engine (10).

7. The filler case (12, 13) has a double wall structure made of resin having an inner wall (14, 15) and an outer wall (16, 17). The internal combustion engine according to any one of claims 3 to 6, wherein the sound insulation layer (18, 19) is formed between the outer wall (16, 17) and the outer wall (5). Intake device.

8. Intake system components (21, 25, 100) for passing intake air to the internal combustion engine (10) are housed in the case (1, 2, 13) with sound insulation layers (18, 19) An intake device for an internal combustion engine, comprising:

9. The internal combustion engine according to claim 8, wherein the case (12, 13) accommodates a fuel system component (40, 41) for supplying fuel to the internal combustion engine (10). Intake device.

10. The case (12, 13) has a double wall structure made of resin having an inner wall (14, 15) and an outer wall (16, 17). 10. The intake device for an internal combustion engine according to claim 8, wherein the sound insulation and heat insulating layer (18, 19) is formed between the outer wall (16, 17) and the outer wall (16, 17).

1. The intake device for an internal combustion engine according to claim 1, wherein the sound insulation layer is an air layer (18, 19).

12. The sound insulation layer between the inner wall (14, 15) and the outer wall (16, 17) is filled with a sound insulation material as the sound insulation layer. 11. The intake device for an internal combustion engine according to any one of 7, 10.

13. The intake device for an internal combustion engine according to claim 1, wherein the sound insulation layer is formed of a foamable material.

14. The sound-insulating and heat-insulating layer applies foam material to the filter case (12, 13) walls. The intake device for an internal combustion engine according to any one of claims 3, 4, 5, 6, 8, and 9, wherein the intake device is formed by wearing.

1 5. The sound insulation layer according to claim 3, 4, 5, 6, 8, 9, wherein the filter case (12, 13) is formed by secondary molding of a foamable material at the time of molding. The intake device for an internal combustion engine according to any one of the above.

1 6. An air filter (2 1) for filtering intake air to the internal combustion engine (10),

The filter case (12, 13) that accommodates the air filter (21) and the intake air that is disposed in the filter case (12, 13) and is filtered by the air filter (21) A flow outlet duct (24);

A filter support (22) formed in a shape corresponding to the air filter (21) is provided at an inlet of the outlet duct (24).

An air intake device for an internal combustion engine, wherein the air filter (21) is detachably supported by the filter support (22) independently of the filter case (12, 13).

1 7. In the filter case (12, 13), a throttle valve (25) connected to the outlet of the outlet duct (24), and the intake air passing through the throttle valve (25) The intake device for an internal combustion engine according to claim 16, characterized in that an intake manifold (100) for guiding the internal combustion engine to the intake port (10a) of each cylinder of the internal combustion engine (10) is accommodated.

1 8. The air filter (2 1) and the filter support (22) are arranged in an upper part of the inside of the filter case (12, 13),

The outlet duct (24), the throttle valve (25), and the intake manifold (100) are arranged below the air filter (21) and the filter support (22). The intake device for an internal combustion engine according to claim 17, wherein:

1 9. The air filter (2 1) is equipped with a filtration section (2 1a) for filtering intake air. And a flange portion (21b) protruding outward from the outer peripheral portion of the filtration portion (21a).

A flange portion (24a) is formed on the outer periphery of the filter support (22).

The one of claims 16 to 18, characterized in that the flange (21b) is detachably supported by the clamp (23) with respect to the flange (24a). An intake device for an internal combustion engine according to claim 1.

20. The air filter (2 1) has a filtering portion (2 1a) for filtering intake air and a flange portion (2 1b) projecting outward from an outer peripheral portion of the filtering portion (2 1a). And

A fitting groove (24b) is formed on the outer periphery of the filter support (22).

Any of claims 1 to 6 to 1 8, characterized in that it is elastically detachably fitted and supported with respect to the flange portion (2 1 b) force ⁵ 'the fitting groove (24 b) The intake device for an internal combustion engine according to claim 1.